Explosions in Syria's Aleppo kill at least 12

In this photo provided by the Syrian official news agency SANA, Syrian security agents carry a body following a huge explosion that shook central Damascus, Syria, Thursday, Feb. 21, 2013. A car bomb shook central Damascus on Thursday, exploding near the headquarters of the ruling Baath party and the Russian Embassy, eyewitnesses and opposition activists said. (AP Photo/SANA)

BEIRUT (AP) — Syrian activists say at least 12 people, including children, have been killed in three explosions in the northern city of Aleppo.

The director of the Britain-based Syrian Observatory for Human Rights, Rami Abdul-Rahman, says the blasts appeared to have been caused by missiles. He says they hit the eastern neighborhoods of Hamra and Tariq al-Bab on Friday.

The Observatory says dozens of people were wounded, and that many more are believed to be trapped under the rubble of damaged buildings. It says the death toll may rise.

Videos posted online showed what appeared to be the aftermath of the explosions. In one, at least nine bodies are laid out on a floor, some of them wrapped in blankets.